Mount assembly for high wattage lamps



2, 1932- A. c. MASSIE 1,869,572

MOUNT ASSEMBLY FOR HIGH WATTAGE LAMPS Filed March 27, 1929 INVENTOR I ACM 2 2% M24 777 WATTORN Patented Aug. 1932 PATENT. OFFICE 1 UNITED STATES ARNOLD GRA'WIOR ID MASSIE, OF BLOOMIIEIJD; NEW JERSEY, ASSIGNOR TO WESTING- HOUSE LAMP COMPANY, A CORPORATION OF PENNSYLVANIA MOUNT ASSEMBLY FOR HI [GH WATIAGE Application'filed March 27, 1929. Serial No. 850,319.

This invention relates to incandescent electric lamps and more particularly to incandescent electric lamps of the projection type and has for its object the provision of a method of mounting the incandescing member of said device in rigid, strain free relation to the press of said device.

Another object of this invention is to facilitate the manufacture of incandescent electric lamps of the projection type. 7

Another object is to provide a means of supporting the filament structure in incandescent electric lamps in a substantially rigid predetermined position.

Another object of this invention is to provide a means of mounting the filament structure of incandescent electric lamps of the projection type so as to be substantially resistant to distortion by mechanical shock.

Another object of this invention is to provide an incandescent electric lamp of the projection type having a rigidly mounted filament structure electrically connected to the lead in wires in substantial strain free relationship thereto.

Other objects and advantages will become apparent as the invention is more fully disclosed.

In incandescent electric lamps of the projection type, especially in high wattage lamps, useful in search light, flood light and other like devices, which are fixedly mounted in reflector housings, it is essential for the light source to be highly concentrated and fixedly positioned within the device so that the same may be focused in the reflector housilhis requires the use of segmented coil type filaments, each of which segments must be retained in position by mechanical means so as to prevent undue distortion and departure from the selected or desired light source position under the influence of the heating and cooling effects during operation, or the effects of mechanical shock during manufac ture, shipping or handling incident to use.

The present invention contemplates the provision of a method of mounting the filament and support members so that the same may be rigidly maintained in position and coil type filament 1 suspensionally positioned between bridge su port members 2 and 3, and supported by vertlcal support members 4 and 5 integral with metal collars 6 and 7 is mounted upon the stem 9 by causing the metal collars 6 and 7 to frictionally engage a tubular projection portion 8 of the stem 9, the support members 4 and 5 are electrically connected by flexible connectors 10 and 11 to the leadin wires 12 and 13 making metal to glass seals 14 and 15 in the stem 9 of the device.

The bridge support suspending members 2 and 3 are separately disclosed and claimed in Patent No. 1,786,623 issued December 2, 1930 to A. G. Massie and assigned to the same assignee as the present invention.

A mount constructed in accordance with my invention is illustrated in enlarged side elevational View partly in cross section in Fig. 2 and comprises a so-called flare tube 16, having the usual flange 17 which may be fusibly connected to the bulb neck of an enclosing glass envelope. The flare tube is provided with a tubular projection member 8 (sometimes called a pedestal) arranged to be frictionally engageable by the collar clamps 6 and 7 integral with the ends of the filament support wires 4 and 5. The collar clamps 6 and 7 are of similar construction each of which comprises a split ring blank and a draw bolt 18 and 19 for securing the collars to the projection or pedestal member 8 of the flare'16.

Oppositely disposed with respect to the projection 8 in flare tube 16, are provided glass seals. 14 and 15 in which lead in wires 12 and 13 areembedded, which lead wires" are connected in the usual manner to stranded copper conductors 24 and 25 which are 29 be soldered into the pins 26 and 27 of i 1. The metal glass seals 14 and 15 are of the t pe disclosed in copending application erial #350,511, filed March 28, 1929, by A. C. Massie, entitled Flexible metal to glass seals, which application is assigned to the same assignee as the present application. Such type seals have been designed to give great flexibility and resistance to fracture when subjected to the heating and cooling efl'ects incident to operation of incandescent electric lamps of the projection type, and inthe present invention are comprised of tungsten as the leading-in wire.

For the urpose of providing electrical connection etween filament support members 4 and 5 Fig. 2, and the tungsten lead wires 12 and 13, flexible stranded copper connectors 10 and 11 are provided each of which have ends secured to the filament support members 4 and 5 and opposite ends connected to the end of the tungsten lead in connectors 12 and 13 projecting from the seal, said connection being made in any manner consistent with good electrical conductivity and in such position that the weight thereof is practically carried by the filament support members 4 and 5, and so that the said metal to glass seals of press and the said filament structure rigidly mounted upon the pedestal 8 are electrically connected in what might bfitermed substantially strain free relations 1p.

Fig. 3 shows a side elevational view partly in cross-section of the tubular projection member 8, Fig. 2 serving as supporting means for filament structure of the incandescent electric lamp, in which is shown an optional construction which may be used in the manufacture of a lamp of the tipless type. The projection member 8 is centrally traversed y an exhaust tube 30, which projects through the open end of the flare tube 16, Fig. 2 and is adapted to serve as an exhaust tube in the removal of gases from the interior of the device.

In the manufacture of a lamp the exhaust tube may however be integral with the en closing glass envelope of the device and be positioned at point 31, Fig. 1. I

In the forming of a mount in accordance with the present invention the filament structure, including the support members 4 and 5, the bridge support suspension members 2 and 3 and the segmented coil type filament 1 are assembled in a rigid structure and connected by spot weld or other convenient means to the split ring collars 6 and 7 The flare tube with the tubular projection member is then provided witha pair of flexible tungsten glass seals in accordance with the invention disclosed in copendin applica tion by A. C. Massie above identi ed.

Briefly the method disclosed in said copending application contemplates forming a gas tight union between an especially cleansed and smoothened surface of tun ten and a thin film of a high melting g ass having" an approximate but dissimilar coeflicient of expansion, this hermetic seal is then floated within an opening in the glass portion of the stem of an electric device in such manner that the tungsten is substantially supported only by the thin film glass seal ad'- herent thereto.

Such a method of forming tungsten seals has an advantage over the customary seal heretofore employed in that a higher electrical current may be passed through the tungsten than heretofore possible because of the factthat any heating efl'ect accompanying the passage of the electric current and consequent thermal expansion of the glass and metal portion of the seal do not deleteriously affect the hermetic state of the seal. This is due, it is believed, to the fact that the greater flexibility or elasticity of the thin film of glass "Wetted to the tungsten metal surface compensates for the differences in the coeflicients of expansion of the materials.

Such a seal, however, will not carry any appreciable weight and it is essential that the filament structure of an electrical device, such as an incandescent electric lamp utilizing this seal, be rigidly mounted independent of said seal and electrically connected there- 20 in such manner as to be substantially strain ree.

I accomplish this result as indicated in Fig. 2 by providing intermediate said floating tungsten seals a tubular projection member on the stem of-suflicient length and diameter to provide a rigid mounting means for the filament structure of the device.

I then attach the assembled filament structure by means of the metal collars 6 and 7 to the tubular projection 8 of the stem mem ber of the press by tightening up the draw bolts 18 and 19, Fig. 2 in the metal collars.

The diameter of the tubular projection member should be such that maximum strength is obtained and resistance to fracture under the tensional strains incident to the frictional engagement of the metal straps thereon.

The assembled mount comprising the rigid filament structure frictionally engaging a tubular projection member of the stem, and electrically connected in strain free relationship to the flexible tungsten lead-in wires of said stem, is then enclosed in a suitable glass envelope by fusibly connecting the flange of the flare tube to the envelope in the usual manner. The device is then evacuated in the usual manner, either through the tubular projection member as indicated in Fig. 3 or through a tubulature in the top of the enclosing glass envelope as indicated in Fig. 1 at 31. Following the usual exhaust and baking operations an inert gas filling may be intro- I duced into the bulb if desired.

It is appreciated that there are many variations from the specific embodiment of the invention as herein described but such variations are anticipated as fall within the m scope of the following claims.

What is claimed is:

1. An incandescent electric lamp comprising a bulb, support wires secured to said bulb, a filament secured to said support wires, leading in wires extending through the wall of said bulb, said wall having portions surrounding said leading in wires in intimate contact therewith terminating in feather edges adjacent said leading in wires, and a 20 flexible connection between said leading in wires and said filament support wires.

2. An incandescent electric lamp comprising a bulb, a flare tube sealed to said bulb, a rigid filament supporting structure secured 25 to said flare tube, a filament mounted on said structure, leading in wires extending through the wall of said bulb, said walls being sealed to said leading in wires by means of a flexible glass union thereto, and resilient means for 30 electrically connecting said leading in wires to said filament structure in strain free relationship.

3. An incandescent electric lamp mount comprising a flare tube, conductive support 35 members rigidly secured to said flare tube, leading-in wires extending through the wall of said flare tube, said wall being sealed to said leading-in wires by means of a flexible glass union and resilient means for electrical- 0 1y connecting said leading-in wires to said cplnductive supports in strain free relations 1 4 An incandescent electric lamp mount comprising a flare tube, a projection extending from said flare tube, conductive support members secured to said projection, leadingin wires extending through the wall of said flare tube, said wall being sealed to said leading in wires by means of a flexible glass union 5e and resilient means for electrically connecting said leading-in wires to said conductive supports in strain free relationship.

In testimony whereof, I have hereunto subscribed my name this 22d day of March, 1929.

Us ARNOLD CRAWFORD MASSIE.

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